US8927863B2 - Anti-corrosion structure for wire connecting portion - Google Patents

Anti-corrosion structure for wire connecting portion Download PDF

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Publication number
US8927863B2
US8927863B2 US13/814,105 US201113814105A US8927863B2 US 8927863 B2 US8927863 B2 US 8927863B2 US 201113814105 A US201113814105 A US 201113814105A US 8927863 B2 US8927863 B2 US 8927863B2
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United States
Prior art keywords
wire
barrel
terminal
sealing resin
connecting portion
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US13/814,105
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English (en)
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US20130126235A1 (en
Inventor
Naotaka Tanikawa
Hiroko Kato
Kazumasa Kobayashi
Eiji Kojima
Hiroshi Kobayashi
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Sumitomo Wiring Systems Ltd
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Sumitomo Wiring Systems Ltd
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Filing date
Publication date
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Assigned to SUMITOMO WIRING SYSTEMS, LTD. reassignment SUMITOMO WIRING SYSTEMS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOBAYASHI, HIROSHI, KOJIMA, EIJI, KATO, HIROKO, KOBAYASHI, KAZUMASA, TANIKAWA, NAOTAKA
Publication of US20130126235A1 publication Critical patent/US20130126235A1/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/04—Cable-end sealings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/70—Insulation of connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
    • H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
    • H01R4/183—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section
    • H01R4/184—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section comprising a U-shaped wire-receiving portion
    • H01R4/185—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section comprising a U-shaped wire-receiving portion combined with a U-shaped insulation-receiving portion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/62—Connections between conductors of different materials; Connections between or with aluminium or steel-core aluminium conductors

Definitions

  • the present invention relates to an anti-corrosion structure for a wire connecting portion.
  • An aluminum wire is, for example, structured by covering a core formed by twisting a plurality of aluminum strands with a coating.
  • the aluminum wire is connected to a wire connecting portion of a terminal.
  • This wire connecting portion is specifically composed of a wire barrel portion to be crimped and connected to an end of the core exposed by stripping the coating at an end of the aluminum wire and an insulation barrel portion to be crimped and connected to an end of the remaining coating.
  • the housing is open upward and the wire connecting portion can be arranged while being displaced upward, but the sealing resin interferes with the inner wall of a through hole provided in the housing if the wire connecting portion is displaced upward in the case of accommodating the terminal into the through hole.
  • the sealing resin interferes with the inner wall of a through hole provided in the housing if the wire connecting portion is displaced upward in the case of accommodating the terminal into the through hole.
  • the present invention was developed based on the situation as described above and an object thereof is to prevent electrolytic corrosion of a wire connecting portion while permitting the interference of a sealing resin and the inner wall of a through hole.
  • the terminal assembly includes a wire including a core made of metal and covered with a coating; a terminal made of a metal different from the core and including a wire connecting portion connected to an end of the wire; a sealing resin sealing the wire connecting portion; and a housing including a through hole with a front opening and a rear opening.
  • the terminal is made of a different kind of metal from the core of the wire.
  • the housing accommodates the terminal in the through hole.
  • the wire connecting portion includes an exposed portion not covered with the sealing resin and unexposed portions covered with the sealing resin. The exposed portion is obtained after the sealing resin is rubbed against an inner wall of the through hole.
  • the exposed portion is arranged in an intermediate part of the wire connecting portion excluding a front end part and a rear end part thereof.
  • the wire connecting portion is partly exposed at the both front and rear end parts thereof due to the interference of the sealing resin with the inner wall of the through hole, interfaces between the sealing resin and the wire are exposed and water tends to enter the wire connecting portion through these interfaces.
  • a part (exposed portion) of the wire connecting portion is exposed in the intermediate part of the wire connecting portion and an interface between the sealing resin and the wire connecting portion is exposed at the exposed portion.
  • the sealing resin and the wire connecting portion are held in close contact with each other, water does not enter the wire connecting portion through this interface.
  • electrolytic corrosion of the wire connecting portion can be prevented while the interference of the sealing resin and the inner wall of the through hole is permitted.
  • FIG. 1 is a section showing a state where a terminal in a first embodiment is inserted in a proper posture in a through hole when viewed sideways.
  • FIG. 2 is a section of the terminal in FIG. 1 when viewed from above.
  • FIG. 3 is a section showing a state where a stepped part interferes with a sealing resin at an advanced position when viewed sideways.
  • FIG. 4 is a section showing a state where the stepped part is in contact with an exposed portion at the advanced position when viewed sideways.
  • FIG. 5 is a section showing a state where the stepped part interferes with the sealing resin at a retracted position when viewed sideways.
  • FIG. 6 is a section showing a state where the stepped part is in contact with the exposed portion at the retracted position when viewed sideways.
  • FIG. 7 is a section showing the state where the stepped part interferes with the sealing resin at the advanced position when viewed from above.
  • FIG. 8 is a section showing the state where the stepped part is in contact with the exposed portion at the advanced position when viewed from above.
  • FIG. 9 is a section showing the state where the stepped part interferes with the sealing resin at the retracted position when viewed from above.
  • FIG. 10 is a section showing the state where the stepped part is in contact with the exposed portion at the retracted position when viewed from above.
  • FIG. 11 is a section showing a terminal in a second embodiment in a state where a stepped part interferes with a sealing resin when viewed sideways.
  • FIG. 12 is a section showing a state where the stepped part is in contact with an exposed portion when viewed sideways.
  • FIG. 13 is a section showing the state where the stepped part interferes with the sealing resin when viewed from above.
  • FIG. 14 is a section showing the state where the stepped part is in contact with the exposed portion when viewed from above.
  • a terminal 10 in this embodiment is made of copper alloy and includes a terminal connecting portion 20 connectable to a male terminal (see FIG. 11 ) and a wire connecting portion 30 formed behind this terminal connecting portion 20 .
  • This terminal 10 is inserted and accommodated from behind into a through hole 41 formed to penetrate a housing 40 in forward and backward directions.
  • a locking lance 42 extending forward in a cantilever manner is formed in the through hole 41 . This locking lance 42 is engaged with the terminal 10 , whereby the terminal 10 is held in the through hole 41 so as not to come out backward.
  • the terminal connecting portion 20 is in the form of a rectangular tube which is open forward and backward, and the male terminal is fittable thereinto through a front end opening thereof. Further, a resilient contact piece 21 is formed in the terminal connecting portion 20 by being folded backward from the front edge of the bottom wall of the terminal connecting portion 20 . This resilient contact piece 21 is resiliently deformable in a vertical direction, and resiliently comes into contact with the male terminal fitted into the terminal connecting portion 20 . In this way, the male terminal is sandwiched between the resilient contact piece 21 and the ceiling wall of the terminal connecting portion 20 and the terminal 10 and the male terminal are electrically conductively connected.
  • the terminal connecting portion 20 is formed with a lance hole (not shown) into which a projection (not shown) formed on the locking lance 32 is fitted for a locking purpose. Since the opening of this lance hole is one size larger than the projection, a clearance is formed between the edge of the opening and the projection. Thus, the terminal 10 is permitted to move in forward and backward directions by as much as the clearance. In this way, the terminal 10 is made loosely movable in forward and backward directions between an advanced position (position of the terminal 10 shown in FIG. 3 ) and a retracted position (position of the terminal 10 shown in FIG. 5 ).
  • the wire connecting portion 30 is connected to an end of an aluminum wire W formed by covering a core W 1 made of aluminum or aluminum alloy with an insulating coating.
  • the terminal 10 is made of copper alloy.
  • the connection of the core W 1 of the aluminum wire W and the wire connecting portion 30 is the connection of different types of metals having different ionization tendencies.
  • This wire connecting portion 30 is composed of a wire barrel portion 31 to be crimped and connected to the core W 1 exposed by stripping the coating at an end of the aluminum wire W and an insulation barrel portion 32 to be crimped and connected to the remaining coating after stripping.
  • the wire barrel portion 31 includes a pair of barrel pieces 31 A in the form of an open barrel and is crimped to pierce into the core W 1 while the both barrel pieces 31 A are wound around the core W 1 from both left and right sides.
  • the insulation barrel portion 32 is formed to be one size larger than the wire barrel portion 31 , wherein particularly a vertical dimension thereof is about twice as large as that of the wire barrel portion 31 .
  • This insulation barrel portion 32 includes a pair of barrel pieces 32 A in the form of an open barrel and is crimped while the both barrel pieces 31 A are wound around the coating from both left and right sides at the end of the aluminum wire W.
  • a barrel accommodating portion 43 for accommodating the both barrel pieces 32 A of the insulation barrel portion 32 is formed in the through hole 41 .
  • the barrel accommodating portion 43 is formed by radially widening a rear end opening side of the through hole 41 and a stepped part 44 is formed at the front end of this enlarged diameter portion 43 A.
  • the stepped part 44 is arranged substantially in the center of the barrel accommodating portion 43 in forward and backward directions and formed over the entire circumference.
  • the wire connecting portion 30 includes a sealing resin 33 sealed by resin such as silicone rubber or chelating agent.
  • the wire barrel portion 31 and the insulation barrel portion 32 are both embedded in a sealed state by the sealing resin 33 .
  • the sealing resin 33 is not in contact with the inner wall of the through hole 41 in the case of insertion in a proper posture into the through hole 41 . In this case, the inner wall of the through hole 41 and the sealing resin 33 do not slide against each other and the sealing resin 33 is not scraped.
  • the sealing resin 33 interferes with the inner wall of the through hole 41 due to loose movements of the terminal 10 A in forward and backward directions between the advanced position and the retracted position and due to vertical and lateral swinging movements of the aluminum wire W. As a result, the sealing resin 33 is gradually scraped due to repeated sliding movements against the inner wall of the through hole 41 .
  • an exposed portion 34 which is exposed parts of the both barrel pieces 32 A comes to be arranged on outer peripheral surfaces 32 C formed between both front and rear end surfaces 32 F, 32 R of the both barrel pieces 32 A of the insulation barrel portion 32 .
  • the stepped part 44 comes into line contact with the sealing resin 33 and slides against it due to an upward swinging movement of the aluminum wire W at the advanced position. If the sealing resin 33 is scraped by the stepped part 44 at the advanced position, the stepped part 44 comes into contact with the exposed portion 34 arranged on the outer peripheral surfaces 32 C of the both barrel pieces 32 A as shown in FIG. 4 .
  • the exposed portion 34 arranged on the outer peripheral surfaces 32 C of the both barrel pieces 32 A as shown in FIG. 4 .
  • water does not enter the wire connecting portion 30 through these interfaces since the sealing resin 33 and the outer peripheral surfaces 32 C of the both barrel pieces 32 A are held in close contact at these interfaces.
  • the stepped part 44 comes into line contact with the sealing resin 33 and slides against it due to an upward swinging movement of the aluminum wire W at the retracted position. If the sealing resin 33 is scraped by the stepped part 44 at the retracted position, the interfaces between the sealing resin 33 and the outer peripheral surfaces 32 C of the both barrel pieces 32 A are exposed at the exposed portion 34 as shown in FIG. 6 , but water does not enter the wire connecting portion 30 through these interfaces since the sealing resin 33 and the outer peripheral surfaces 32 C of the both barrel pieces 32 A are held in close contact at these interfaces.
  • FIGS. 7 and 8 show a case where the aluminum wire W is laterally swung at the advanced position. The configuration, function and effect of this case are not described since being the same as in the case where the aluminum wire W is swung upwardly.
  • FIGS. 9 and 10 show a case where the aluminum wire W is laterally swung at the retracted position. The configuration, function and effect of this case are not described since being the same as in the case where the aluminum wire W is swung upwardly.
  • the interference of the stepped part 44 and the sealing resin 33 due to a swinging movement of the aluminum wire W is permitted.
  • the exposed portion 34 is arranged between the front and rear end surfaces 32 F, 32 R of the both barrel pieces 32 A, i.e. on the outer peripheral surfaces 32 C.
  • the entrance of water into the wire connecting portion 30 through the exposed portion 34 can be avoided. Therefore, electrolytic corrosion of the wire connecting portion 30 can be prevented.
  • the interference of the sealing resin 33 with the barrel accommodating portion 43 can be avoided.
  • the stepped part 44 comes into line contact with the sealing resin 33 , an exposed area of the exposed portion 34 can be reduced.
  • the terminal of the present invention is applied to a male terminal.
  • a terminal 50 of this embodiment is connectable to a female terminal (see FIG. 1 ).
  • the terminal 50 includes a tab portion 51 to be fitted into the female terminal.
  • the tab portion 51 is in the form of a flat plate.
  • FIG. 11 shows a state where a stepped part 62 formed on the inner wall of a through hole 61 of a housing 60 interferes with a sealing resin 53 sealing a wire connecting portion 52 of the terminal 50 with resin due to an upward swinging movement of an aluminum wire W at an advanced position.
  • FIG. 12 shows a state where the stepped part 62 comes into line contact with an exposed portion 54 exposed on outer peripheral surfaces 52 C of both barrel pieces 52 A forming the wire connecting portion 52 due to sliding movements of the sealing resin 53 and the stepped part 62 against each other.
  • FIG. 13 shows a state where the stepped part 62 interferes with the sealing resin 53 due to a lateral swinging movement of the aluminum wire W at the advanced position.
  • FIG. 14 shows a state where the stepped part 62 comes into line contact with the exposed portion 54 exposed on the outer peripheral surfaces 52 C of the both barrel pieces 52 A due to sliding movements of the sealing resin 53 and the stepped part 62 against each other.
  • interfaces between the sealing resin 53 and the outer peripheral surfaces 52 C of the both barrel pieces 52 A are exposed at the exposed portion 54 .
  • water does not enter the wire connecting portion 52 through these interfaces since the sealing resin 53 and the outer peripheral surfaces 52 C of the both barrel pieces 52 A are held in close contact at these interfaces.
  • electrolytic corrosion at the wire connecting portion 52 can be prevented.
  • the stepped part comes into line contact with the outer peripheral surfaces of the both barrel pieces of the insulation barrel portion in the above embodiments, it may come into line contact with the outer peripheral surfaces of the both barrel pieces of the wire barrel portion according to the present invention.
  • the insulation barrel portion is in the form of an open barrel including the pair of barrel pieces in the above embodiments, it may be in the form of a closed barrel having a cylindrical shape according to the present invention.
  • the stepped part is formed in the barrel accommodating portion for accommodating the insulation barrel portion in the above embodiments, it may be formed in the inner wall of the through hole accommodating the wire barrel portion according to the present invention.
  • the sealing resin does not come into contact with the inner wall of the through hole when the terminal is inserted in a proper posture into the through hole in the above embodiments, it may be more or less pressed into the through hole according to the present invention.
  • wire connecting portion is crimped and connected to the core made of aluminum in the above embodiments, soldering may be applied to the core and then the wire connecting portion may be crimped and connected to this soldered core according to the present invention.
  • the wire may have an exposed end portion not covered with the coating and a coating portion covered with the coating.
  • the wire connecting portion may include a wire barrel portion and an insulation barrel portion.
  • the wire barrel portion may be crimped onto the exposed end portion.
  • the insulation barrel portion may include a barrel piece crimped onto the coated portion.
  • the exposed portion of the wire connecting portion may be located at an outer peripheral surface of the barrel piece.
  • the outer peripheral surface may be located between edges of the barrel piece in the front and rear direction. According to such a configuration, an interface between the sealing resin and the outer peripheral surface of the barrel piece is exposed at the exposed portion exposed on the outer peripheral surface of the barrel. However, since the sealing resin and the outer peripheral surface of the barrel piece are held in close contact with each other, water does not enter the wire connecting portion through this interface.
  • the through hole may include a barrel accommodating portion in which the barrel piece is accommodated.
  • the barrel accommodating portion includes an enlarged diameter portion at a position close to the rear opening of the housing and a small diameter portion on a front side of the enlarged diameter portion.
  • the enlarged diameter portion has a larger diameter than the small diameter portion so that a stepped part is provided therebetween.
  • the stepped part is located at a position corresponding to the exposed portion of the wire connecting portion. According to such a configuration, an exposed area of the exposed portion can be reduced since the stepped part comes into line contact with the sealing resin.
  • An inner wall of the barrel accommodating portion may be in non-contact with the sealing resin when the terminal is in an original position in the through hole. According to such a configuration, the interference of the sealing resin with the inner wall of the through hole can be avoided when the terminal is inserted in the proper posture into the through hole.
  • the core of the wire may be made of one of aluminum or aluminum alloy and the terminal may be made of copper alloy. According to such a configuration, the occurrence of electrolytic corrosion can be prevented effectively even in the case of using an aluminum wire having a high possibility of electrolytic corrosion.

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  • Connector Housings Or Holding Contact Members (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
US13/814,105 2010-08-06 2011-06-17 Anti-corrosion structure for wire connecting portion Expired - Fee Related US8927863B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2010-177446 2010-08-06
JP2010177446A JP5409545B2 (ja) 2010-08-06 2010-08-06 電線接続部の防食構造
PCT/JP2011/063897 WO2012017744A1 (fr) 2010-08-06 2011-06-17 Structure anticorrosion pour partie de branchement de fil

Publications (2)

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US20130126235A1 US20130126235A1 (en) 2013-05-23
US8927863B2 true US8927863B2 (en) 2015-01-06

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US13/814,105 Expired - Fee Related US8927863B2 (en) 2010-08-06 2011-06-17 Anti-corrosion structure for wire connecting portion

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US (1) US8927863B2 (fr)
EP (1) EP2602881B1 (fr)
JP (1) JP5409545B2 (fr)
CN (1) CN103069658B (fr)
WO (1) WO2012017744A1 (fr)

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US20140030901A1 (en) * 2012-07-27 2014-01-30 Tyco Electronics (Shanghai) Co., Ltd. Conductive Connecting Terminals
US20140087597A1 (en) * 2011-06-03 2014-03-27 Yazaki Corporation Connection terminal and method for manufacturing connection terminal
US20150140874A1 (en) * 2012-07-31 2015-05-21 Yazaki Corporation Aluminum Cable Provided with Crimping Terminal
US20160276777A1 (en) * 2013-11-19 2016-09-22 Yazaki Corporation Terminal-attached electric wire
US20170154706A1 (en) * 2015-11-26 2017-06-01 Sumitomo Wiring Systems, Ltd. Electrically conducting path
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US20190305443A1 (en) * 2018-03-30 2019-10-03 Autonetworks Technologies, Ltd. Terminal-equipped wire and wire harness
US11133634B2 (en) * 2019-04-16 2021-09-28 Yazaki Corporation Terminal-equipped electric wire manufacturing apparatus and terminal-equipped electric wire
US11482799B2 (en) * 2020-03-23 2022-10-25 Yazaki Corporation Terminal-equipped electric wire and method of manufacturing terminal-equipped electric wire
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JP5391173B2 (ja) * 2010-09-30 2014-01-15 古河電気工業株式会社 電線と端子の接続構造及び接続装置、接続方法、ワイヤーハーネス
JP2013045576A (ja) * 2011-08-23 2013-03-04 Yazaki Corp コネクタ端子
JP5741344B2 (ja) * 2011-09-20 2015-07-01 住友電装株式会社 コネクタ
JP5741343B2 (ja) * 2011-09-20 2015-07-01 住友電装株式会社 コネクタ
JP5965751B2 (ja) * 2012-07-03 2016-08-10 矢崎総業株式会社 コネクタ端子及びコネクタ端子の止水方法
JP5995146B2 (ja) * 2013-09-06 2016-09-21 株式会社オートネットワーク技術研究所 コネクタ
US9937583B2 (en) 2013-12-24 2018-04-10 Innovative Weld Solutions Ltd. Welding assembly and method
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KR101833659B1 (ko) 2014-03-24 2018-02-28 후루카와 덴키 고교 가부시키가이샤 와이어 하니스, 피복 도선과 단자의 접속 방법 및 와이어 하니스 구조체
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US20130126235A1 (en) 2013-05-23
EP2602881A1 (fr) 2013-06-12
EP2602881B1 (fr) 2015-07-22
WO2012017744A1 (fr) 2012-02-09
CN103069658A (zh) 2013-04-24
JP2012038566A (ja) 2012-02-23
JP5409545B2 (ja) 2014-02-05
EP2602881A4 (fr) 2014-01-15
CN103069658B (zh) 2015-04-01

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